Yoshimura’s RS-4 Available for the 2010 Yamaha YZ450F

Yoshimura has announced the RS-4 Exhaust system in both Slip-on and Full System configurations for the Yamaha YZ450F. The RS-4 features a Yoshimura duplex chamber that cancels out negative exhaust pulses and acts as a sort of mechanical baffle before the actual perforated baffle area. This improves overall power while lowering the sound emission.




RS-4 Comp Series Slip-on

This pipe has a stainless/aluminum muffler construction with a carbon fiber tip and a 96dB spark-arrested insert. Other optional inserts available for this pipe are a motocross 99dB non-spark arrested version, and a 94dB motocross non-spark arrested. The stainless tailpipe bolts right onto the stock header for easy installation.



RS-4 Stainless/Aluminum Slip-On
SKU:2348704
Price: $395.00

RS-4 Comp Series Full Systems

The RS-4 Comp full system features a stainless/aluminum muffler construction with a carbon fiber tip. The muffler is spark arrested with a 96dB insert. An optional 94dB spark-arrested insert is also available. If you’re looking for non-spark arrested options, there are motocross inserts in either 99dB or 94dB (which is AMA legal).

RS-4 Stainless/Aluminum Full System
SKU:2348504
Price: $645.00

RS-4 Titanium/Titanium Full System
SKU:2348167
Price: $995.00

RS-4 Pro Series Full Systems

With full titanium construction, the RS-4 Pro Series comes with your choice of either a carbon fiber or titanium muffler. Either way, the RS-4 comes with a carbon fiber tip. The muffler comes standard with a non-spark-arrested motocross insert at 99dB, but an AMA-legal 94dB insert is also available.

RS-4 Titanium/Carbon Fiber Full System
SKU:2348162
Price: $1,045.00